Riverbank Publications No. 15 : A Method of Reconstructing the Primary Alphabet from a Single One of the Series of Secondary Alphabets
Riverbank, Geneva Ill. Riverbank Laboratories Department of Ciphers 1954. Reprint. 3-9,[1-blank] p. 28.5 cm. Comb binding. A crisp clean copy with minor crease at the base of the spine. There were 2 issues of this publication - both are marked 1917 on the front cover. The second issue (as offered here) was published in a comb binding, with different paper stock (we've seen several colors of the comb binding, the copy offered here in black). Near Fine. Comb Bound. [23080]
A restricted publication not publically available when issued, it appears in a few institutional collections, but is rarely offered in the market. A note in Friedman's personal files notes: 'This is a photolithographic copy of the original and was produced in a very few copies in 1954.' It is 'Friedman's first writing on cryptology. The primary alphabet is the mixed alphabet used to form a Vigenere-like tableau for alphabetic encipherment; the secondary alphabet is the one recovered by the cryptanalyst.' (Kahn). Authorship attribution from Galland. [ Methods and examples of Deciphering]
See J.S. Galland, An Historical and Analytical Bibliography of Cryptology, page 67. See also Kahn, The CodeBreakers, 1996, p374. Shulman, An Annotated Bibliography of Cryptography, 1976, p80
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